Collapsible form for concrete constructions



Feb. 20, 1934. R s n- 1,947,625

COLLAPSIBLE FORM FOR CONCRETE CONSTRUCTIONS Filed Sept. 21, 1932 5 Sheets-Sheet 1 nvenlor Feb. 20, 1934. R. D. SMITH COLLAPSIBLE FORM FOR CONCRETE CONSTRUCTIONS Filed Sept. 21

1952 5 Sheets-Sheet 2 Invehlor flmaalizm flllomey Feb. 20, 1934.

R. D. .SMITH COLLAPSIBLE FORM FOR CONCRETE CONSTRUCTIONS Filed Sept. 21. 1932 5 Sheets-Sheet 3 Inventor Z2. n9. c/ /W/V Feb. 20, 1934. R. D. SMITH COLLAPSIBLE FORM FOR CONCRETE CONSTRUCTIONS Filed Sept. 21. 1932 5 Sheets-Sheet 4 Patented Feb. 20, 1934 UNITED STATES COLLAPSIBLE FORM FOR CONCRETE CONSTRUCTIONS Roy D. Smith, Lyons, Kans.

Application September 21, 1932 Serial No. 634,237

4 Claims.

This invention relates to a collapsible form for use in concrete constructions, the general object of the invention being to provide a collapsible form for use in a double wall, the form being so I constructed and arranged that the two parts thereof can be held firmly in place while the concrete is being poured to form portions of the two walls and then, after the concrete has set, the inside form can be readily collapsed and removed from between the two walls.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts to be hereinalter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which:

Figure l is a fragmentary elevation with the parts removed, showing how a wall of double construction is formed with this invention.

Figure 2 is a top plan view.

Figure 3 is a section on line 33 of Figure 2.

Figure 4 is a section on line 44 of Figure 2.

Figure 5 is a fragmentary view of one of the I beams.

Figure 6 is a section on line 66 of Figure 2.

Figure 7 is an enlarged detail view with parts in section showing how a cam part formed on a plunger engages a pair of spreaders.

Figure 8 is a fragmentary plan view showing a modification of the invention.

Figure 9 is a fragmentary edge view.

Figure 10 is a fragmentary view of the beam shown in Figures 8 and 9.

In these drawings the letter A indicates the outside form of plates or members and the letter B 40 the inside plates or form members. These members are arranged to form a double wall, as shown in Figure 2 so as to provide an air space C between the walls in which plumbing and electric wiring can be placed. Vertically arranged I beams D are placed in the walls with central I beams tying the two walls together and the form plates have their ends resting against the flanges of these beams as shown in Figure 2. The flanges of the I beams are perforated to receive the tie wires 1 which are also passed through the form plates as shown in Figure 2. Each form plate is formed with the reinforcing ribs 3 on its outer face.

Pairs oi vertical plate like members 7 are 63' placed between the inside form members B and each pair of these members are connected together by pins 8. Some of these pins pass through ears 9 formed on the members 7 and spreaders or cam members 10 are pivotally arranged on the pins which pass through the ears 9, the pins pass- .0 ing through intermediate portions of the spreaders as shown in Figure 7. Each spreader is preferably of the shape shown in Figure 7 with one end larger than the other and with the large end lowermost and with the edge of the spreader 6| farthest from the form member B of arcuate shape as shown at 11. The lowest end of the spreader is connected to a plate 12 by a pin 13 and these plates 12 are connected to the form plates as shown at 14, these plates 12 being prefer- I0 ably of angle shape as shown. A plunger rod 15 is slidably arranged between each pair of the members 7 and this rod is provided with the enlargements 16 the opposite edges of which are of arcuate shape as shown in Figure 7 so as to engage the arcuate edges 11 of the spreaders or cam members 10.

Stop pins 8' are carried by the members 7 for limiting the upward and downward movement of the plunger 16 and the camsas shown in Figso ure '7.

I prefer to place a pair of the expanding and contracting elements between each pair of the inside form members B, as shown in Figure 2 and to connect the upper ends of the two rods 15 5 together by a cross bar 1'7 so that by pulling upon this bar 17 the plunger rods'will be raised or lowered simultaneously.

From the foregoing it will be seen that after the form plates or members A and B are placed against the flanges of the I beams the plunger rods 15 are pressed downwardly so that the enlargements 16 will engage the enlarged ends of the spreaders or cam members 10 and thus force the spreaders outwardly and thus press the form members B against the flanges of the I beams and firmly hold them in position while the concrete is being poured and while the concrete is setting. After the concrete has set the plunger rod 15 are moved upwardly so as to engage the small ends of the spreaders 10 which will move the large end of said spreaders toward each other and pull the form members B toward each other away from the inner faces of the two walls and then the entire assembly and the members B and the expanding and contracting devices can be raised from between the walls;

With this invention the parts may be used over and over again and the inside form members are firmly held in. position against the pressure of no the concrete but may be easily pulled away from the concrete after the same is set, and liIted from between the two walls.

In the modification shown in Figures 8, 9 and 10, beams 18 are used to tie the two walls together, each beam extending across the space between the walls and the outer form members-A are connected to the flanges of each beam 18 by the tie members 19. Each of these members 19 is of substantially T-shape with its stem passing through a slot 20 in a flange of the beam 18 with the head resting against the inner face of the flange and the stem twisted as shown at 21 and passing through an opening 22 in a reinforcing iron 23 of a form member A. The outer end of each member 19 is reduced as shown at 24 and has an opening therein to receive a wedge 25 which holds a part of the reinforcing member 23 against a shoulder 26 formed-by the junction of the reduced part 24 with the stern of the member 19. Thus the outer form members A are tied to the beams in spaced relation from the beams as shown in Figures 8 and 9 and by knocking out the wedges 25 the outer form can be removed after the two walls have been formed.

' be adjusted to facilitate the placing of their reduced ends 24 in the openings of the outer forms.

The reinforcing members 23 of the inner and outer forms may be either of channel shape or of angle shape.

As will be seen, in this modified form of the invention the I beams 18, and the members 19 tie the two walls together with the beam '18 passing through the space between the two walls so that the I beams shown as located in the walls in Figure 2 are omitted as are also the tie wires 1, shown in Figure 2.

It will of course be understood that the members 19 and the cotter pins remain in the wall but the wedges 25 can be used over and over again to fasten the outer forms to other memby in the construction and in the combination and arrangement of the several parts provided that such changes fall within the scope of the appended claims.

Having thus described my invention, what I claim as new is:

1. A collapsible form comprising a pair of form members, a supporting member placed between the form members, spreader members pivotally connected to the supporting member, means for movably connecting the spreader members to the form members and a movable member having cam parts thereon for engaging the spreader members for moving said spreader members toward and away from each other to move the form members toward and away from each other.

2. A collapsible form of the class described comprising a pair of form members, supporting members arranged between the form members, plates connected to the inner faces of the form members, elongated spreader members each having a large end pivotally connected to a plate, said spreader members being pivotally connected intermediate their ends with the supporting members and each spreader member having a cam shaped inner edge, a plunger rod having cam enlargements thereon for engaging the cam edges of the spreader members for moving said spreader members to adjust the form members toward away from each other.

3. A- collapsible form of the class described comprising a pair of form members, projecting portions formed on the inner faces of said form members, pairs of vertically arranged elongated members arranged between the form members, a plunger rod vertically movable between each pair of the last mentioned members and said last mentioned members having ears thereon, spreader members located between the ears of each and pivotally connected to said ears, each spreader member being of elongated form with the lower end enlarged and its inner edge of cam shape, means for pivoting the enlarged end of each spreader member to a projection of a form member and said plunger rod having cam shaped enlar ements for engaging the cam edges of the members for moving the enlarged ends thereof outwardly when the plunger rod is moved downwardly and moving said enlarged ends toward each other when the plunger rod is moved upwardly and a cross bar connecting the upper end of each pair of plunger rods together.

a. for constructing a pair of walls with space between them comprising a pair of outer forms havin holes therein, a pair of inner forms, I beams extending across the space to be formed by the walls, expanding and contracting means connected with the inner forms for pressing such inner forms against portions of the beams, the flanges of said beams having holes therein, tie members passing through said holes in the flanges of the I beams, and through said holes in the outer forms, said tie members having openings in their outer ends, and wedges for connecting the outer forms to the outer ends of the tie members said wedges passing through the holes or openings in the tie members.

ROY D. SMITH. 

